Lola Domnina Pestaño (2021) “Determination of the Packing Factor of Geopolymerized Perlite from Lamba, Albay, Bicol in the Philippines, Its Development and Characterization and the Design of a Packed Column for the Absorption of Ammonia Gas”, Current Approaches in Science and Technology Research Vol. 2, pp. 47–60. doi: 10.9734/bpi/castr/v2/8455D.